Fine grain photographic developer



Patented A r. 16, 1940 ma cam rnorocnarmo navnnoran William H. Wood,more, om, mlto Harris- Seybold-Potter Company, Ohio, a corporation ofDelaware Cleveland,

No Drawing. Application May 1'2, loss. a Serial No. 274,225

1'4 Claims. 501. 95-) It has been suggested to employ ethanolamine saltsin developers, for supplying desired weak alkalinity or for assistingthe action of fine grain developers, but these combinations havesuch atendency to generation of developing-fog" as to preclude practicalutility. I have now found however that if the compounds set forth in myco-pending application Serial No. 270,922, viz. compounds from the classconsisting of reaction products of morpholine andsulphur dioxide, whichfor convenience I will referto herein. as

morpholine sulphite and morpholine bisulphite or generically assulphites of morpholine, be incorporated in compositions withhydroxyaliphatic amine salts, the surprising effect results that thereis an inhibiting of developing-fog, and there is enhancement of finegrain developer action'obtainable. Peculiarly, I'furthermore have foundthat when a sulphite of morpholine is incor- Il porated in aparaplienylenediamineglycin type of developer itis possible to applylarger proportions of ethanolamine salts or the like than when thesulphite ,of morpholine is not present. further makes it possible toreduce the proportion of 18' glycin in, the developer while maintainingthe desired rate of activation of the developing agentparaphenylenediamine with resultant further increase in fineness ofgrain. Especially advantageous control thus of amine salts may be had.

80 To the accomplishment of the foregoing and related ends, theinvention, then, comprises the features-hereinafter fully described, andparticularly pointed out in the claims, the following descriptionsetting forth in detail certain illus- 05 trative embodiments of theinventiomthese being indicative however, of but a few of the variousways in which the principle of the invention may be employed. I v

The salts of the hydroxyaliphatic amines which 40 may beemployed are forinstance those of monotions of these salts for results desiredmay be 50employed in the developing composition, considerable variation beingpermissible depending upon the type and amount of developing agent andotherconstituents employed, and-upon the nature of the results desired.For'instance, 0.01 to 2 55 grams of the hydroxyaliphatic amine salt pereach '100 cc. 6r developer solution may in general beemployed.

The proportions of the sulphites of morpholine suitable in this use arein general about 0.1 to 2 grams oi morpholine sulphite for each 100 cc.of 5 developer solution.

An illustrative example of a fine grain developer in accordance with theinvention is as follows:

Grams l0 Glycin 2 Paraphenylenediamine 18 Morpholine sulphite Q 40Potassium bromide 0.5 Ethanolamine sulphite. 20 ll Sodium sulphite 80The foregoing per each 1000 of water.

stated, and is preferred, the proportion of this constituent may bevaried to higher amounts. A particularly small grain silver deposit isobtained, and there is a noticeable decrease in time required todevelopthe given density. The deposit is supeg5 rior to that produced byordinary physical development, and superior in density and contrast-tothat obtained by the usual alkaline developers.

Other modes ofapplying the principle of the invention may be employed,change being made as regards the details described, provided thefeatures stated in any of the following claims, or the equivalent ofsuch, be employed.

I therefore particularly point out and distinctly claim as my invention:

1. In a process of preparing photographic images, incorporating in thedeveloper paraphenylenediamine,v parahydroxyphenyl glycin, sodiumsulphite, potassium bromide, mono-- ethanolamine sulphite and a sulphiteof mor- 4o pholine. p

2-. In a process of preparing photographic images, incorporating in thedeveloper paraphenylenediamine, parahydroxyphenyl glycin, 'sodiumsulphite, potassium bromide, monoethanolaminephosphate and a sulphite ofmorpholine. 1

,3. In a process of preparing photographic images, incorporating in thedeveloper paraphenylenediamine, parahydroiwphenyl glycin, sodiumsulphite, potassium bromide, an inorganic salt of a hydroxyaiiphaticamine and asulphite .of morpholine.

4. In preparing photographic images, developing the image in thepresence of paraphenylenediamine, monoethanolamine sulphite and asulphite of morpholine.

5. In preparing photographic images, developing the image in thepresence of paraphenylenediamine, monoethanolamine phosphate and asulphite of morpholine. V

6. In preparing photographic images, developing the image in thepresence of paraphenylenediamine, an inorganic salt of ahydroxyaliphatic amine, and a sulphite of morpholine.

7. In preparing photographic images, developing the image .in thepresence of a silver halide developing agent and a sulphite-ofmorpholine and an inorganic salt of a hydroxyaliphatic fine grain type,monoethanolamine phosphate,

and a sulphite of morpholine.

10. In preparing photographic images, incorporating with a silver halidedeveloping agent of fine grain type, an inorganic salt of ahydroxyaliphatic amine, and a sulphite of morpholine.

11. A photographic developer containing paraphenylenediamine,parahydroxyphenyl glycin,

sodium sulphite, potassium bromide, mono-'.

ethanolamine sulphite, and a sulphite of morpholine. v

12. A photographic developer containing paraphenylenediamine,parahydroxyphenyl glycin, sodium sulphite, potassium bromide,monoethanolamine phosphate, and a-sulphite of morpholine.

'13. A photographic developer containing paraphenylenediamine,parahydroxyphenyl glycin,

sodium sulphite, potassium bromide, an inorganic salt of ahydroxyaliphatic amine, and a sulphite of morpholine.

14. A photographic developer containing a silver halide developing agentand a sulphite of morpholine and an inorganic salt of a hydroxyaliphaticamine. l

. WILLIAM H. WOOD..

